Studies on the separation of minor actinides from high-level wastes by extraction chromatography using novel silica-based extraction resins
Studies on the separation of minor actinides from high-level wastes by extraction chromatography using novel silica-based extraction resins
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DOI：
10.13182/nt00-a3154
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发表时间：
2000-12-01
影响因子：
1.5
通讯作者：
Odoj, R
中科院分区：
文献类型：
--
作者：
Wei, Y;Kumagai, M;Odoj, R
为了开发一种先进的萃取色谱分离工艺，以最少的有机溶剂和紧凑的设备从硝酸酸性高放废液（HLW）中分离Am和Cm等次要锕系元素，制备了几种新型的硅基萃取树脂。萃取剂包括辛基（苯基）-N，N-二异丁基氨基甲酰基甲基氧化膦（CMPO）、二（2-乙基己基）磷酸（HDEHP）和双（2，4，4-三甲基戊基）二硫代次膦酸（Cyanex 301）。与传统的聚合物基体树脂相比，这种新型萃取树脂具有动力学快、填充柱压力损失小等特点，可将三价锕系元素和镧系元素与其它裂变产物如Cs、Sr、Cu、Zn、用CMPO/SiO（2）-P树脂填充柱，在模拟高放废液浓硝酸溶液中，用萃取色谱法测定了钌和钌。用新纯化的Cyanex 301/SiO（2）-P树脂从pH 4的模拟高放废液中分离了Am（III）和大量镧系元素。然而，Am（III）的分离对Cyanex 301的纯度非常敏感，提高其稳定性是实际应用的重要任务。
To develop an advanced partitioning process by extraction chromatography using a minimal organic solvent and compact equipment to separate minor actinides such as Am and Cm from nitrate acidic high-level waste (HLW) solution, several novel silica-based extraction resins have been prepared by impregnating organic extractants into the styrene-divinylbenzene copolymer, which is immobilized in porous silica particles (SiO(2)-P). The extractants include octyl(phenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide (CMPO), di(2-ethylhexyl)phosphoric acid (HDEHP), and bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex 301). Compared to conventional polymer-matrix resins, these new types of extraction resin are characterized by rapid kinetics and significantly low pressure loss in a packed column.The results of separation experiments revealed that trivalent actinides and lanthanides can be separated from other fission products, such as Cs, Sr, and Ru in simulated HLW solution containing concentrated nitric acid by extraction chromatography using a CMPO/SiO(2)-P resin-packed column. Satisfactory separation between Am(III) and a macro amount of lanthanides from simulated HLW solution with pH 4 was achieved by using a newly purified Cyanex 301/SiO(2)-P resin. However, the Am(III) separation was very sensitive to the purity of Cyanex 301, and the improvement of its stability is an important task for practical utilization.